US 11,867,448 B2
Refrigerator and method for controlling the same
Sangbok Choi, Seoul (KR); Kyongbae Park, Seoul (KR); Sungwook Kim, Seoul (KR); and Sung Jhee, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Sep. 25, 2020, as Appl. No. 17/032,566.
Application 17/032,566 is a continuation of application No. PCT/KR2019/003205, filed on Mar. 19, 2019.
Claims priority of application No. 10-2018-0034490 (KR), filed on Mar. 26, 2018.
Prior Publication US 2021/0025639 A1, Jan. 28, 2021
Int. Cl. F25D 21/00 (2006.01); F25D 21/08 (2006.01); F25D 21/02 (2006.01)
CPC F25D 21/006 (2013.01) [F25D 21/02 (2013.01); F25D 21/08 (2013.01); F25D 2700/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A control method by a refrigerator comprising:
operating a heat generating element of a sensor reacting to a change in a flow rate of air for a predetermined period of time;
detecting a temperature of the heat generating element, a first detection temperature that is sensed by a sensor in response to the heat generating element turned on and a second detection temperature that is sensed by the sensor in response to the heat generating element turned off, wherein the second detection temperature is sensed in response to the turning off after the heat generating element maintained the turning on for sensing the first detection temperature;
performing a defrosting operation of an evaporator when a temperature difference value between the first detection temperature and the second detection temperature is less than a first reference difference value;
updating the temperature difference value between the first detection temperature and the second detection temperature after the defrosting operation is completed;
detecting residual frost on the evaporator based on the temperature difference between the first detection temperature and the second detection temperature among detection temperatures of the heat generating element.